This title appears in the Scientific Report :
2007
Please use the identifier:
http://hdl.handle.net/2128/7721 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.75.224434 in citations.
Magnetization dynamics induced by ultrashort optical pulses in Fe/Cr thin films
Magnetization dynamics induced by ultrashort optical pulses in Fe/Cr thin films
The magnetization dynamics of single-crystalline Fe(001) thin films with Cr cap layers has been studied by an all-optical time-resolved pump-probe technique. The system is characterized by a fourfold in-plane magnetic anisotropy. We observed long-lived (similar to 1 ns) magnetization oscillations ca...
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Personal Name(s): | Rzhevsky, A. A. |
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Krichevtsov, B. B. / Bürgler, D. E. / Schneider, C. M. | |
Contributing Institute: |
Elektronische Eigenschaften; IFF-9 JARA-FIT; JARA-FIT Center of Nanoelectronic Systems for Information Technology; CNI |
Published in: | Physical Review B Physical review / B, 75 75 (2007 2007) 22 22, S. 224434 224434 |
Imprint: |
College Park, Md.
APS
2007
|
Physical Description: |
224434 |
DOI: |
10.1103/PhysRevB.75.224434 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Physical Review B
75 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.75.224434 in citations.
The magnetization dynamics of single-crystalline Fe(001) thin films with Cr cap layers has been studied by an all-optical time-resolved pump-probe technique. The system is characterized by a fourfold in-plane magnetic anisotropy. We observed long-lived (similar to 1 ns) magnetization oscillations caused by the ultrafast (similar to 0.15 ps) optical pulse excitation. The oscillations are associated with the temporal variation of the magnetization component M-z normal to the film surface. The phase of the oscillations is independent of the polarization state of the pump beam giving evidence for a predominantly thermal origin of the excitation. The amplitude of the oscillations considerably depends on the in-plane orientation and magnitude of the magnetic field. The azimuthal variation of the oscillation frequency at constant magnetic field follows the fourfold in-plane magnetic anisotropy. Angle and field variations of the frequency are well described by a uniform precession mode known from the theory of ferromagnetic resonance. Our analysis indicates that the precession amplitude is determined by the frequency of the uniform mode and an in-plane tilting of the effective magnetic field directly caused by the pumping light beam. |